Measurement of the Magnetic Moment of the Antiproton

Abstract

We have measured fine-structure splittings in atoms formed by antiprotons with both lead and uranium. Since the fine structure is produced by an interaction between the magnetic moment of the antiproton and the Coulomb field of the nucleus, a value for the magnetic moment can be derived from the observed splitting. We find a magnetic moment of - 2.83 \ifmmode\pm\else\textpm\fi{} 0.10 nuclear magnetons which agrees with the $\mathrm{TCP}$ prediction.